Effect of Reaction Parameters on Catalytic Performance of Fe/Cu/K/SiO_2 for Slurry Phase Fischer-Tropsch Synthesis
摘要
Fischer-Tropsch synthesis over the spray-dried Fe/Cu/K/SiO2 catalyst was pe rformed in a slurry reactor under different reaction conditions for about 1?4 00 h . The results indicated that the changes of the reaction conditions, espe cially the reaction temperature and H2/CO feed ratio had strong effects on the catalytic performance of the Fe/Cu/K/SiO2 catalyst. The addition of liquid pa raffin medium had no distinct influence on the catalyst stability. An increase i n the space velocity of the feed gas could effectively increase the hydrocarbon productivity and suppress the water-gas-shift (WGS) reaction, but evidently de crease the CO conversion and the selectivity for heavy hydrocarbons. Increasing the H2/CO feed ratio notably increased the H2 partial pressure in the reaction system, suppressed the WGS reaction and raised the CO conversion. Howev er, the higher hydrocarbon productivity and selectivity for heavy hydrocarbon an d olefin products could be obtained at a lower H2/CO feed ratio. The increase in the system pressure apparently improved the activity and heavy hydrocarb on selectivity of the catalyst. The reaction could be markedly accelerated by in creasing the reaction temperature, while the heavy hydrocarbon selectivity decre ased because of the occurrence of the WGS reaction.